Lathe.



No. 783,680. PATENTED FEB. 28, 1905. N. D. GHARD.

LATHE.

APPLIUATION FILED SEPT. 12, 1904.

Smozntoz lllllo. 783,680.

lll nirlsn marine l tatented. February 223, 190th clientele.

l arletrr .NlClrl'OLAS D. lHARl). Cl! CINCINNATI, 01-110, ASSlCNUR TU'llxll l LODGE a SHlPLlfiY MACHINE TOOL COMPANY, OF ClNClNNA'll,(ll-lit), A CORPC SPECIFICATION forming part of Letters Patent N 0.783,680, dated February 28, 1905.

Application filed September 12, 1904. Serial No. 224,077.

To (bl/ll who/n, zit may concern:

lie it known that .I, NIonoLAs D. CHART), a citizen of the UnitedStates, residing at Cincinnati, in the county of Hamilton and State ofOhio, have invented certain new and useful improvements in Lathes, ofwhich the following is a specification.

My invention relates to a new and improved gibbed-way connection betweenthe bed and carriage of an engine-lathe.

The features of inyinvention are more full y set forth in thedescription of the accompanying drawings, forl'ning a part of thisspecification, in whieh Figure 1 is a central vertical section oflathe-bed with carriage shown in elevation embodying my improvement.Fig. 2 is a section on line a; a, Fig. 1.

The object of my invention is to provide a gibbed-way connection betweenan enginelathe carriage and bed of such construction that the upper andoutward strains of the apron or carriage relative to the bed shall beborne by the bed at right lines to the direction of strain. Anotherobject of my invention is to take from the rail which guides thecarriage all lateral strain and substantially all bearing strain exceptthat of guiding the carriage longitudinally of the bed.

1 represents the bed of the lathe.

2 represents the front longitudinal rail of the bed, and 3 the rearlongitudinal rail of the bed. These rails are provided with the guideti-ways 4c 5. The rails extend inwardly and are provided with verticalsides (5 7 and the horizontal sides 8 9.

10 represents the carriage, having W-ways engaging the guide-rails L 5.The carriage is provided with a central bearing-block 11, which projectsdownwardly between the rails 2 3, and has a vertical bearing against thevertical edges 6 7 of said rails.

12 represents a bottom bearing-plate extended under and between theinner edges of the rails 2 3 and having a bearing upwardly against thehorizontal bearing-surfaces 8 9 of said rails.

13 represents clamping-bolts for securing the bearing-plate '12 to theblock 1 l.

It will be observed that this construction is very rigid. All of theoutward or lateral strains are borne by the vertical bearing-surfaces (57 of the ti -rails and all the upward or vertical strains are borne bythe horizontal bearing-surfaces 8 9 of the bed -surfaces. None of thesevertical or lateral thrusts are borne by the guide W-rails i 5, andhence these W-rails have the sole function of longitudinally guiding thecarriage. Thus as all strains are removed from these vertical guides theaccuracy of the guide feature and its durability are greatly enhanced.

As there are no shelving, wedging, or angular strains in'iparted to thebed by the carriage, the tendency to spread the bed-rails apart isavoided.

As the bearing-surfaces of the block 'l'l and plate 12 bridge completelythe space between and under the bed-rails, the strains on the oppositesides of the bed are substantially equally distributed and an anchorageis given the carriage upon both sides of the bed which increases therigidity and durability of the entire machine.

Having described my invention, .l. claim in an engine-lathe, a bedprovided with two bed-rails, said rails on their upper surfaces beingprovided with longitudinal ti guiderails, said rails having verticalguide-surfaces on their inner edges, and horizontal guide- 30 surfaceswithin the bed, a carriage having W-ways engaging the said Wguide-rails, said carriage having a bearing-block projected downwardbetween the bed-rails and engaging the vertical bearing-surfacesthereof, a bearingplate within the bed between the bed rails having anupward bearing engagement against the horizontal beariiiig-surfaces ofthe bed-rails, and clamping-bolts securing the bearing-plate to thebearingblock, substantially as described.

In testimony whereof I have hereunto set my hand.

NlCllULr S l). CHARI).

Witnesses:

OLivnu li. .Kiusnn, Luisa linen.

